Package: A set of 6 pieces brushes,3 flat brush, 3 sharp brush, 3 sizes (small, medium, large) suitable for kids, students, amateur and artists. Ideal for back to school supplies. Easy to Use and Control: Watercolor brush pens simply unscrew the watercolor pens' barrel to add water or ink. Simply to squeeze the barrel to easily control the ink or water flow.Ideal for blending colors and creating custom shades.(Note: Please make the water less than 2/3 of the water brush pen's volume when filling water into the pen) Quality Nylon Brush: Good quality nylon hair brush tips ensures smooth and consistent strokes and the watercolor brush pen stay intact and does not spray, spread, or smear while in use. The watercolor pen is convenience, lightweight, portable,making fillable watercolor brush an essential tool for artists and hobbyists to use at home, in a studio Versatile Watercolor Pens: These watercolor brush pen are suitable for various mediums including watercolor, gouache, powdered pigment, water-soluble pencils, acrylics, and inks. You can draw the finest line or color large lines, blend colors and create new shades Quick Water Cleanup: No need for complicated steps. Effortlessly clean your brushes with just water after every creative session Inside Package: 6 pcs water color brushes,3 flat brush, 3 sharp brush, 3 sizes (small x2, medium x2, large x2 ). Size: Flat brush Small - hair width : 0.6cm, hair length : 1cm Medium - hair width : 0.8cm, hair length : 1.6cm Large - hair width : 1.5cm, hair length : 1.7cm Sharp brush Small - hair width : 0.3cm, hair length : 1.2cm Medium - hair width : 0.5cm, hair length : 1.5cm Large - hair width : 0.6cm, hair length : 1.9cm How to use: Watercolor Brush Pens simply unscrew the watercolor pens' barrel to add water or ink. Simply to squeeze the barrel to easily control the ink or water flow. (Note: Please make the water less than 2/3 of the pen's volume when filling water into the pen). Change your life: No mess watercolor brush pen gives you peace of mind while painting. No more dealing with messy water bowls and spilled water!